Patents by Inventor Edwin J. Parssinen

Edwin J. Parssinen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Broadband free-flooding magnetostrictive scroll transducer
    Patent number: 4223401
    Abstract: A free-flooding, deep submergence cylindrical magnetostrictive transducer ving a plurality of identical, coaxial, ring-shaped scrolls, surrounded by a toroidal coil, the scrolls being vibration isolated from each other and from the coil, and having ring resonance frequency sufficiently close to cavity resonance frequency for broadband operation, i.e. approximately one octave at the 6 db down points.
    Type: Grant
    Filed: July 15, 1968
    Date of Patent: September 16, 1980
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Edwin J. Parssinen, Theodore J. Meyers
  • Double mass-loaded high power piezo-electric underwater transducer
    Patent number: 4219889
    Abstract: 1.
    Type: Grant
    Filed: September 16, 1960
    Date of Patent: August 26, 1980
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Edwin J. Parssinen, John F. White, Sidney Baron
  • Underwater acoustic pressure release reflector
    Patent number: 4090171
    Abstract: 1. An underwater acoustic reflector for use at elevated hydrostatic press comprising:(A) a plurality of thin paper laminae assembled in an integrated stack wherein all the paper laminae run in essentially the same direction,(B) a thin-walled gas confining wrapping intimately surrounding and enclosing said stack of paper, and(C) a waterproof jacket enclosing said wrapped stack of paper and being of a material having characteristic acoustic impedance approximately the same as that of seawater enclosing said wrapped paper.
    Type: Grant
    Filed: February 18, 1963
    Date of Patent: May 16, 1978
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Robert J. Bulmer, Edwin J. Parssinen